A stylus pen is a small, pen-like tool used to interact with touchscreens on devices like tablets and smartphones. It allows for precise input, making it easier to draw, write, or navigate compared to using fingers. Stylus pens can be especially useful for artists and note-takers who need accuracy in their work. There are different types of stylus pens, including passive and active styles. Passive stylus pens do not require batteries and work by conducting touch, while active stylus pens, such as those made by Apple or Samsung, have built-in technology for pressure sensitivity and additional features.